Here is the full list of all 24 The Light Brigade achievements.
Kill an enemy sniper from far away.
Kill an enemy bomber using a grenade.
Spend 1,000 gold at a store.
Finish your first run, start to finish.
Defeat the Father.
Land 250 headshots. (accumulated)
Use the wishing well.
Try to fire your weapon without first reloading it.
Land 250 gunshots. (accumulated)
Travel 1,000 meters. (accumulated)
Reload 100 times. (accumulated)
Defeat the first boss.
Defeat the second boss.
Rescue an ally Light Brigade soldier out on a run.
Cock an ally Light Brigade soldier's rifle.
Use an enemy's dropped weapon to kill another enemy.
After death, find your ghost and pray to it.
Pray to the Mother.
Die and be revived for the first time.
Hold onto 1,000 coins at once during a run.
Never miss a shot during a fully completed run.
Every single shot during a fully completed run is a headshot.
Kill an enemy priest using magic.
Have a hypnotized enemy kill another enemy.